LONDON (Reuters) - U.S. Secretary of State John Kerry said on Thursday he had seen raw data suggesting that Syria used chlorine in gas attacks against its own people, though he said the data had not yet been verified.

Syria may have used chemical weapons involving chlorine in 14 attacks in recent months, French Foreign Minister Laurent Fabius has said.

"I have seen the raw data that suggests, that there may have been, as France has suggested, a number of instances in which chlorine has been used in the conduct of war," Kerry said, adding that the data had not yet been verified.